Horner APG SmartStack I/O HE800DNS600/HEDNS600 - Manual (Page 86)

MAN0577-03-en
Page 86 of 98 EO 09-0009
DeviceNet Modules
HE800DNM650 & HE800DNS600
REGISTER DESCRIPTION VALUE
%AQ1 Start of Transmit Buffer 101
%AQ2 Number of Bytes to Transmit 7
%AQ3 Start of Receive Buffer 51
%AQ4 Receive Buffer Allocation Size 20
In the following example we want to write the polled expected packet rate to the node at MACID 3, we
also want to locate the transmit buffer at %R101, the receive buffer at %R51, we will also allocate 20
bytes to the receive buffer.
BYTE
NUMBER REGISTER
NUMBER
DESCRIPTION
TRANSMIT
BUFFER DATA
0 R101 LSB MACID (Node Address) 03
1 R101 MSB Service Code (Set Attribute Single) 16
2 R102 LSB Class ID (Connection Class) 05
3 R102 MSB 00
4 R103 LSB Instance ID (Polled Connection) 02
5 R103 MSB 00
6 R104 LSB Attribute (Expected Packet Rate) 07
7 R104 MSB Data Value Low Byte E8(Hex)
8 R105 LSB Data Value High Byte 03
REGISTER DESCRIPTION VALUE
%AQ1 Start of Transmit Buffer 101
%AQ2 Number of Bytes to Transmit 9
%AQ3 Start of Receive Buffer 51
%AQ4 Receive Buffer Allocation Size 20
9.3
How to Interpret Explicit Response Messages
The normal, expected response from an Explicit Message is the Acknowledge Message:
BYTE
NUMBER
DESCRIPTION
EXAMPLE
0 Number of
bytes received
Xx
1 Xx
2 MACID 01
3 *Service
Code 0x90(Hex)
4 Optional Data Xx
- Optional Data Xx
- Optional Data Xx
n Optional Data Xx
* Previously sent Service Code (0x10) + 0x80
Note: The Most Significant Bit in the Service Code byte is used as a Response Bit indicating that the
command was properly received. [Service Code 0x10 + Response Bit 0x80 = 0x90]. If any extra data
needs to be returned, that data will be placed into subsequent bytes.